Overload Protection; Troubleshooting - Miller Electric Inverter Rack Owner's Manual

4-2. Overload Protection

4-3. Troubleshooting

Trouble
No weld output from any welding
power sources; units completely
inoperative.
No weld output from one welding pow-
er source.
1
2
3
4
Place line disconnect switch in On position (see Section 3-9).
Check and replace line fuse(s), if necessary, or reset circuit breakers (see Section 3-9).
Check for proper input power connections to rack (see Section 3-9).
For racks containing Power circuit breakers, place applicable Power circuit breaker in On position; for
racks containing fuse blocks, check fuses in applicable fuse block (see Section 4-2).
Check for proper input power connections to welding power source (see Section 3-5).
Check applicable welding power source according to its Owner's Manual.
1 Control Box
2 Power Circuit Breaker In
Racks For 230/460 Volt XMT
304/EX 300 Models And
230/460 Volt XMT 456/
Invision 456 Models);
Location Of 3-Phase Fuse
Block (460/575 Volt XMT 304
Models And 575 Volt XMT
456/Invision 456 Models)
Each Power circuit breaker or fuse
block protects the welding power
source connected to it from
overload.
If a Power circuit breaker opens,
the matching welding power source
shuts down. Manually reset the
Power circuit breaker.
3 3-Phase Fuse Block In Racks
For 460/575 Volt XMT 304
Models And 575 Volt XMT
456/Invision 456 Models
4 Fuses
If fuse(s) in fuse block opens, the
matching welding power source
shuts down. To check fuse block,
place line disconnect switch in Off
position and open hinged fuse hold-
er on applicable fuse block to ac-
cess fuses. Check fuses, and re-
place if necessary.
Remedy
ST-801 703 / ST-801 767
OM-818 Page 19